CVE-2026-8879_CVE-2026-8879

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts() at runtime. This script is NOT declared in manifest.json and bypasses Chrome Web Store static security review. It runs on all URLs and immediately hides all page content, creates a full-page overlay, pauses all videos, and only restores content when the service worker confirms the page passes filtering. If Securly's servers are unreachable, pages remain indefinitely hidden.

Basic Information

ID CVE-2026-8879

Source certcc

Published Jun 3, 2026 at 18:11

Modified Jun 4, 2026 at 14:13

Affected Product

Vendor Securly

Product Securly Chrome Extension

Affected Versions Securly Securly Chrome Extension 0

CWE Classification

CWE-829

References

kb.cert.org /vuls/id/595768

{
    "lastseen": "",
    "description": "Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts() at runtime. This script is NOT declared in manifest.json and bypasses Chrome Web Store static security review. It runs on all URLs and immediately hides all page content, creates a full-page overlay, pauses all videos, and only restores content when the service worker confirms the page passes filtering. If Securly's servers are unreachable, pages remain indefinitely hidden.",
    "published": "2026-06-03T18:11:04.269Z",
    "modified": "2026-06-04T14:13:20.892Z",
    "type": "cve",
    "title": "CVE-2026-8879",
    "source": "certcc",
    "references": "https://kb.cert.org/vuls/id/595768",
    "id": "CVE-2026-8879",
    "bulletinFamily": "",
    "cwe": [
        "CWE-829"
    ],
    "cvelist": null,
    "sourceData": "Securly Securly Chrome Extension 0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Securly Chrome Extension",
    "version": "0",
    "vendor": "Securly",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}